Offset mechanism for printing-presses



i J. 1. WALSER. OFFSET MECHANISM FOR PRINTING PRESSES.,

APPLICATION 'FILED JUNE I8, I91]- Patented Feb. 24,1920.

2 SHEETS-SHEET I- 1.1. WALSER OFFSET MECHANISMFOR PRINTING PRESSES,

APPLICATION FILE-D JUNE 18. 1911.

Patented Eek-24,1920.

2 SHEETS-SHEET 2- v ED STATES PA rENT; OFFICE.

JOSEPH J. WALSER, OF CHICAGO, ILLINOIS, AS SIGNOR TO GOSS PRINTING PRESS 7 COMPANY, A CORPORATION OF ILLINOIS.

' orrsnr MECHANISM non rnmrrms-rnnssns.

Specification of Ietters Patent.

Application filed June 18, 1917. Serial No. 175,409.

-Printing-Presses, of which the following is a specification. v

The invention relates to rotary perfec-tiizig printing presses, and more especially to o set methods, and to ofiset devices cooperating with the second impression cylinder, to prevent offset from, and smutting of, the previously printed side of the web. I

Objects and advantages of the invention will be set forth in part hereinafter and in part. will be obvious herefrom,'or may be ascertained by practice with the invention, such objectsand advantages being realized and attained through the means, instrumentalities, and combinations pointed out in the appended claims. he invention consists in the novel parts, constructions, arrangements, combinations and improvements herein shown and described.

The accompanying-drawings, referred to herein and forming a part hereof, illustrate one embodiment of the invention, and together with the description serve to explain the principles thereof.

Of the drawings:

Figure 1 is a view 1n elevation, largelydiagrammatic, of a device constructed? in accordance with the. tion; and

Fig. 2 is a'similar view of a somewhat different form" of mechanism constructed in accordance with the principles of the invention.

In running a freshly printed web from the first printing couple of a perfecting press into the second printing couple of the press to be 'perfected thereby, the freshly rinted side of the web is against the surace of the impression cylinder as the web passes thereabout and through the impression of the second printing couple. It is essential especially 1n the better grades of printing, to provide devicesdesigned to prevent the offset of the fresh ink upon the surface of I the impression cylinder, and also thereby avoiding or obviating the resultant principles of the invensmutting or soiling of the web in turn from the surface of the impression.

v. in greater or less degree, the offsetting fIOIIfl ace 0 the freshly printed Web onto the sur the impression cylinder, while not being sufficient on the other hand to soil the freshly printed web. In certain cases, an oil oflset device has been em loyed in connection with one or the other 0 the other kinds of offset devices just described.

Certain disadvantages are inherent in the Patented Feb. 24, 1920.

employment of the i various. ofl'set devices heretofore known. In'commercial work a certain amount of ink is more or less gradually deposited on the packing or blanket or other surface of the 1m ression cylinder,

and there ismore or lessgiving ofl of paper dust, which mixes with the. given-0E ink, and these gradually cake or dry on the surface of the cylinder. This dirt, consisting in part ofdry ink and of paper-dust, becomes intermixed with the oil, and renders the latter dirty, and in the present systems or mechanisms this dirt is again carried back and deposited upon the impression cylinder, and thus the Web is smutted and soiled to a greater or less degree. When an ofl'set'web is used or a shiftingtympan sheet, the offset paper picks up the ink and the paper dust and these gradually become matted or pressed into the paper, thereby soiling the printed web and to some extent causing deterioration inthe impression. Also thereby the offset web is made much thicker than when 'cl'eanand fresh and the ofi'setroll becomes very much larger, which in itself is a great-inconvenience, especially when the space allotted thereto inthe press is limited;

An object of the present invention is to eliminate or obviate the gathering of ink on the packing or other surface of the offset cylinder, and to prevent the old oil and dirt having a hard, smooth surface.

4 is mounted upon a pair of arms 6, fixed on a-shaft 7, the shaft being oscillated by ply and deposited therein, and to provide means for gathering the mixed oil ink and paper dust from the surface of the impression cylinder and for depositing it in areceptacle whereby it will be prevented from contaminatin the oil supplied to and used in the offset. evices.

-Referring to the accompanying drawings, illustrating by way of example an embodiment of the invention, and referring more particularly to-Fig. 1, an oil fountain 1 is provided with'a fountain roller 2 of the usual type, which roller is rotated either continuouslyor intermittentl as desired. A blade 3 cooperates with ro ler 2, thereby permitting only a very thin film of oil to pass on the surface of the roller 2 and to be taken therefrom by the feed roller 4:.

The roller 4 is oscillated between the fountain roller 2 and an intermediate-roller 5, preferably of metal, or other material The roller of the impression cylinder, or. it can be run a little slower or a little faster if desired. This roller lays an exceedingly thin film of oil on the surface of the impression cylinder .9. The web a; runs about the impression cylinder 9 with its previously printedside in contact with the surface of the cylinder. As the web 00 runs between the impression cylinder 9 and the form cylinder 10 the second side of the web is printed. Y

Cooperating with the impression cylinder 9 and running in contact with the surface thereof beyond the point of emergence of the web a: (Fig. 1) is a roller 11, provided with a surface which has more or less of an absorbing and carrying capacity. This roller 11 is run preferably at ,a different speed from the surface speed of the impression cylinder 9, either faster or slower and in many cases a speed of about three-quarters the surface ,speed of the impression cylinder 9 will be found effective. The roller 11 runs also in contact with the intermediate roller 5, already described.

Running also in contact with the roller 5 is a-conveying roller12, the roller 12 also running in contact with a roller'13 which latter roller runs in a dirty oil receptacle 14.

A scraper 15 acts against the surface of the roller 13 to clean it. and to cause any dirt adherent upon the surface of the roller to be deposited in the oil in the fountain 14.. Suitable means for draining and cleaning the fountain 14 may be provided, such as one or more screw taps 16.

; "Cylinder 33 is a form cylinder adapted to print on the same side of the web with cylinder 10, and cylinder 34 bears the same relation to cylinder 32. By this construction and arrangement, a single small size impression cylinder cooperates with two form cylinders to print the second side of a per- *fected web, the impression cylinder preventfeed roller 4' cylinder, being deposited thereon in very minute quantities, but suflicient to prevent appreciable offset from the freshly printed side of the web w, and at the same time not defacing the web with the oil. I

By reason of the roller 8 taking the 011 from the surface of the roller 5, there'is no oil deposited from the roller 5 upon the roller- 11. The roller 11,-it will be remembered, travels in contact with the surface of' the impression cylinder 9 beyond thepoint of emergence of the printed web and ahead of the place of application of the clean oil by roller 8. Roller 11 thus, engages with the surface of the cylinder 9 at a place where it carries any loose ink and paper dust, or other dirt, from the web, and any surplus oil which may be intermixed therewith. By reason of the difference in speedbetween the roller 11 and the impression cylinder 9, and because of the nature of the surface of the roller 11, and by reason of its being dry, it will act as a wiper or cleaner for the surface of the impression cylinder 9. Thus any ink, dust and oil from the portion 0 of the surface of the impression cylinder 9 is picked up by the roller 11, leaving the Surface of the impression cylinder clean and The oil and dirt are then conveyed to that portion of the surface of the roller 5 which is marked '1; and is taken therefrom by the roller 12, and is in turn deposited by the roller 12 upon. the surface of the roller 13. As the roller 13 revolves, the scraper 15 removes all the dirt or oil from the surface thereof, prevents its being carried back to the roller 12, and causes it to be deposited in the oilin the receptacle 14.

It will be understood that the part a of the surface of the rotating roller carries a film of oil, very thin and minute, to the roller 8 which deposits it upon the surface of the impression cylinder 9. The part (I of the surface ofethe rotating roller5 is dry as it comes into contact'with'the portion,e

' of the surface of the rotating roller 11, which carries the waste oil and the dirt from the portion e of the surface of the impression cylinder 9.

The dry surface d of the .roller 5 takes the waste oil and thedir't, which is carried deposition of cleanipil from the roller 2, to

be conveyed forward and to be deposited upon the surface of the impression cylinder 9. v

In 1 ig. 2 of the drawings, is shown another form of mechanism of somewhat simpler construction which will be found sufii dent in some cases. -An oil fountain 20 is provided with a roller 21, and with a blade 22 cooperating with roller 21 to insure only a thin film of oil passing about the roller ,21. A feed roller 23 is mounted-upon arms 24;, which arms are fixed to a shaft 25, said shaft being. oscillated in' a'suitable manner.

' The roller 23 deposits the thin film of oil 'upon the surface of the roller 26, which is preferably of hard and smooth material,

such as metal.

Cooperating with the roller "26, and running in contact therewith is a.ro1ler 27 said roller 27 also running in contact with the impression cylinder 28. -.The roller 27, like roller 8, has a surface preferably of more or lessabsorbent material, such .as-carpet,or

' posit in the receptacle.

'pther suitable fabric.

Also running in con tact with the roller 27 is a roller 29, running in a dirty oil receptacle 30, there being a scraper or cleaning blade 31 in contact with theface of the roller 29 to remove the dirt and oil fromthe roller and to effect its dey The form roller 32 prints the second side of the web a In this form of device, the thin film of oil from the roller 21 isdeposited upon the roller 26, and is carried abouton the po tion It of the surface-of said roller 26. The oil is deposited upon the portion 2' of the roller 27 and from there is deposited upon the portion is of the surface of the impres' sion cylinder, which is clean and free from ink, dust and oil. In this form the portion Z of the surfaceof impression cylinder 28, upon which is the ink, dust or oil left after the emergence of the now perfected web mis acted upon by roller 27, which takes up the dust and oil and carries it along the por-.

therefrom without departing from the prin' ciples of the invention and without sacrificing its chief advantages,;

It will be understood that the term oil as used herein may apply to any kind of offset fluid, so far as concerns many features of the invention. I

\Vhat I claim as. my invention and desire to secure by Letters Patent is as follows:

1. A printing press having an offset mech anism cooperating with an impression cyl inder and including in combination oil ap' plying and oil removin rollers engaging the impression cylinder 0 osely contiguous to each other and a clean oil fountain and a dirty oil receptacle and common means for conveying clean oil to the applying roller, and for removing dirty oil from the removing roller.

2. A printing press havingan offset mechanism cooperating with an impression cylinder and including in combination o1l applying and'oil removing rollers engaging the impression cylinder closely contiguous'to each other and a clean oil fountainand a dirty oil receptacle, and means for conveying clean oil to the applyingroller. and for 105 removing dirty oil from the removing roller.

said means including a common roller.

'3. A printing press having an offset mechanism 'cooperatin with an lmpression cylinder and including in combination a plurality of rollers operating together to apply clean oil' to and to remove'dirtyoil from' the impression cylinder, one of said rollers participating in both said actions.

4. A printing press having an offset mechanism cooperating with an impression cyl inder and including in combination oil applying and oil removing rollers engaging with impression cylinder closely contiguous to each other and a clean oil fountain and a dirty oil receptacle, and means for conveying clean oil to the applying roller and for 18.

. oil removing rollers engaging the impresremoving dirty oil from the removing roller,

said means including a roller conveying clean oil on one side thereof and dirty oil on the other side thereof.

- 6. A printing press including in combination an impression cylinder, two form cylinders cooperating therewith and both printing on the same side of the paper and nearly a semi-circumference apart, and an offset mechanism including oil applying and sion cylinder as a single group at one place on the cylinder, a clean o1l fountam and a dirty oil receptacle and intermediate rollers includinga common roller.

7. In a printing press, an ofi'setimechanism cooperating with an impression cylinder and including in combination a clean oil fountain, a fountain roller therein, a reciprocating feed roller taking 011 from thefountain roller, an intermediate roller receiving the oil from the feed roller, a. roller receiving the oil from the intermediate roller and applying it to the impression cylinder, a roller in advance of the oil applying roller running in contact with the impression cylinder but at a different surface speed, to remove the oil and dirt from the impression cylinder, said removing roller also running in contact with said intermediate roller, a conveying roller receiving the dirty oil from the intermediate roller, and a dirty oil receptacle With a roller therein receiving the dirty oil from said conveying roller, and a scraper removing the dirty .011 and depositingit in said receptacle.

8. In a printing press, an offset mechanism cooperating with an impression cylinsaid removing roller also running in contact with said intermediate roller, a conveying roller receiving the dirty oil from the intermediate roller, and a dirty oil receptacle with a roller therein receiving the dirty oil from-said conveying roller, and a scraper removing the dirty oil and depositing it in said receptacle. I i

In testimony whereof, I have signed my nameto this specificatiomin the presence of two subscribing witnesses.

JOSEPH J. WALSER.

Witnesses:

R, A. BEAL, D. P. MoAULfrFE. 

